```julia julia> Bessels.besselj0(328049.34f0) -0.0013240778f0 julia> Bessels.besselj0(Float64(328049.34f0)) -0.0013258623831875669 ``` I'm imagining the better sin sum here could help. _Originally posted by @heltonmc in https://github.com/JuliaMath/Bessels.jl/pull/88#discussion_r1162007124_ The fix should be with the better `sin_sum` PR. Need to test further.